"Natural-born" communists?

Here's a quote:

Researchers cite University of Southern California cultural anthropologist Christopher Boehm's theory that human nature evolved among egalitarian hunter-gatherers in which group members would band together to thwart individuals who try to dominate their fellows. Indeed, recent research disturbingly finds that players in specially devised economic games will sacrifice their own resources, with no expectation of personal gain, in order to reduce the incomes of top earners and boost the incomes of low earners. This result suggests that people may, in some sense, be natural born communists.

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